principle
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Use the wireless Internet chip (sim card) provided by the wireless carrier to build a wifi hotspot sharing network on this basis.
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With this device, you can extend the Internet connection that is not wifi access
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The wifi network is used by Internet access terminals.
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Among them, the portable wifi that only uses 2G, 3G or 4G as the network source is also called mifi.
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Share the wifi signal from the network without wifi to build a temporary wireless local area network, connect to the Internet, provide one to multiple wireless Internet terminals for use, facilitate mobile office, and provide Internet environment for business trips
This is basically a cloud card traffic pool, and the traffic comes from a random card in the pool, which is cheap but risky.